I need to install a older version of after effects, previous to the 24.x because I don't have the AVX2 resource, I sent a message in the chat and the response was that I could get it in the forum. How should I proceed?

Hi, sorry the chat sent you here. Unfortunately, we can't provide older versions either. The only After Effects versions currently available through Creative Cloud are 25.x and 26.x. Versions older than that have been retired and aren't installable through any official channel. I'd recommend upgrading your machine.

Let me know if there are any other questions.

Thanks,

Nishu